Created attachment 126736 [details] screenshot See the atached screenshot please. Blue bar above "Information about the crash" text box indicates that text was typed ("Minimum length reached"), but it is invisible. Operating System: KDE neon Unstable Edition KDE Plasma Version: 5.18.80 KDE Frameworks Version: 5.68.0 Qt Version: 5.14.1
Moving to kcompletion for investigation. Drkonqi doesn't nothing special here. The line edit is a KLineEdit though. It could be a rendering bug in kwin I guess, but seems terribly unlikely since it only affects this one label apparently.
*** Bug 419856 has been marked as a duplicate of this bug. ***
With gammaray attached I can see the widget in the preview update immediately. It's something with the scrollview. Scrollviews do have some custom code to do low level magic to move buffer contents without a re-render. I've fixed stuff in QtWayland before on that, but weirdly only drkonqi seems affected here. It's also *not* reproducible running just that .ui file standalone in qt designer preview. Given we have another bug in drkonqi it implies some combo of scrollviews and the PageWidget? Probably nothing on KLineEdit.
Found it!! KWallet::Wallet::openWallet(KWAllet::Walllet::NetworkWallet, parent()->windId()); looks innocent, but in fact creates an underlying surface in the wrong place . Will fix.
Git commit 262389b1e49ba12f6d8df8db71e350fb62698c3e by David Edmundson. Committed on 14/04/2020 at 16:48. Pushed by davidedmundson into branch 'Plasma/5.18'. Avoid creating subwindow on internal page widget Summary: KWallet::openWallet takes a windowId as a parameter. QWidget->winId() is a dangerous call, it will create an underlying platform window when called. This happens even if we're not the toplevel widget. On X11 this passed winId must have always been broken, but not in a way that caused a problem. This leaves QtWayland in a very confused state with the side effect that all scrolling widgets become broken. Related: bug 420035 Test Plan: Bisected drkonqi till we found the cause Verified fix by running crashtest (with some mods so I could report a bug) I can't confirm the winId is correct on X11, but the code looks safe Reviewers: #plasma, sitter Reviewed By: sitter Subscribers: sitter, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D28832 M +10 -2 src/bugzillaintegration/reportassistantpages_bugzilla.cpp https://commits.kde.org/drkonqi/262389b1e49ba12f6d8df8db71e350fb62698c3e